Series 4 opens with Martin questioning why he remains in Portwenn. He also reunites with an old girlfriend from his medical- school days and is stunned when Louisa, who left town after he called off their marriage, returns with unexpected news: she's pregnant.

In the Season 1 finale, Poldark is blamed when Verity follows her heart; and Warleggan seeks to stamp out Poldark's smelting operation. In other events, an epidemic leads to tragedy; and a shipwreck proves to b both a blessing and a curse.

Included: "Lambing Season," about a woman who travels to Ireland to meet her father, who left before she was born; and "A Series of Kinetic Sets Tell a Story," in which cardboard sets and characters tell a story of immigration, love and World War II.

The Season 3 finale includes "Nani," about a graffiti artist who introduces an elderly woman to tagging; and "Little Favour," which finds a leaf morphing from clay to pencil to paper while blowing through a series of imaginative worlds.

Daniel decides to send his dad a letter after seeing how happy a letter from his grandfather made him; Daniel learns how bread is made when he and Dad go to Baker Aker's Bakery to buy banana bread for Mom.

Perry Parasaurolophus, a dinosaur with a crest on his head, teaches Buddy, Tiny, Shiny and Don a new way to hoot hip tunes. Later Buddy and Tiny attend an egg-hatching party, where they meet their pal Cory Corythosaurus' new siblings.

Tiny feels left out when Buddy joins a special club for dinosaurs that eat meat, walk on two legs and have three-toed feet. Then Tiny, Shiny and Don throw a surprise party for Buddy on the Dinosaur Train.

Conclusion. An architectural tour of England. Included: Queen's House in Greenwich; Christopher Wren's Church of Magnus the Martyr and St. Paul's Cathedral in London; the urban townhomes of Bath; and Osterley House in Middlesex. Also: Hammerwood Lodge in East Sussex; Saltaire in Yorkshire; Trafalgar Square; Buckingham Palace; and the Clifton Suspension Bridge in Bristol.

Series 4 opens with Martin questioning why he remains in Portwenn. He also reunites with an old girlfriend from his medical- school days and is stunned when Louisa, who left town after he called off their marriage, returns with unexpected news: she's pregnant.

In the Season 1 finale, Poldark is blamed when Verity follows her heart; and Warleggan seeks to stamp out Poldark's smelting operation. In other events, an epidemic leads to tragedy; and a shipwreck proves to b both a blessing and a curse.

Included: "Lambing Season," about a woman who travels to Ireland to meet her father, who left before she was born; and "A Series of Kinetic Sets Tell a Story," in which cardboard sets and characters tell a story of immigration, love and World War II.

The Season 3 finale includes "Nani," about a graffiti artist who introduces an elderly woman to tagging; and "Little Favour," which finds a leaf morphing from clay to pencil to paper while blowing through a series of imaginative worlds.

In the Season 1 finale, Poldark is blamed when Verity follows her heart; and Warleggan seeks to stamp out Poldark's smelting operation. In other events, an epidemic leads to tragedy; and a shipwreck proves to b both a blessing and a curse.

In the Season 1 finale, Poldark is blamed when Verity follows her heart; and Warleggan seeks to stamp out Poldark's smelting operation. In other events, an epidemic leads to tragedy; and a shipwreck proves to b both a blessing and a curse.

Conclusion. An architectural tour of England. Included: Queen's House in Greenwich; Christopher Wren's Church of Magnus the Martyr and St. Paul's Cathedral in London; the urban townhomes of Bath; and Osterley House in Middlesex. Also: Hammerwood Lodge in East Sussex; Saltaire in Yorkshire; Trafalgar Square; Buckingham Palace; and the Clifton Suspension Bridge in Bristol.

The Season 14 premiere tours Mumbai, where stops include the Dharavi slum, made famous by the movie "Slumdog Millionaire"; the fish market at Sassoon Docks; the luxurious Taj Palace Hotel; the sea fort of Murud Janjira; and an open-air laundromat.

In the series opener, English priest Peter Clifford (Stephen Tompkinson) arrives from Manchester to the small Irish town of Ballykissangel, where he meets with disapproval from his crusty superior (Niall Toibin). Brian Quigley: Tony Doyle. Niamh: Tina Kellegher. Assumpta: Dervla Kirwan.

Part 2. A woman travels from Manchester to Ballykissangel to see Peter (Stephen Tompkinson), and her visit forces him to face up to his past in England. Father Mac: Niall Toibin. Brian Quigley: Tony Doyle. Assumpta: Dervla Kirwan.

Nick and Sally learn about camels on a trip to the desert. Then, when the kids stumble in creating a song for their moms, the Cat introduces them to an expert on singing, Humphrey the Humpback Whale. They discover that it's not how one sing that matters, but what one's saying in the song.

The Cat takes Sally and Nick to a forest so that Sally can pick flowers for her ill mother. Along the way, they meet three creatures that depend on flowers to survive. Later, the kids build a snow Cat in the Hat, but panic when it begins to melt. The real Cat, however, knows where to take it to keep it intact: the cold, snowy Arctic.

Cat introduces Sally and Nick to a caterpillar that makes silk after Sally discovers her princess dress is torn and that her mom doesn't have silk thread to fix it. Elsewhere, Cat shows a muddy Nick and Sally how various animals clean themselves.

Martha visits a farm with her family. She tries to help with chores, but soon doubts her ability to be a farm dog. Also: Martha runs away from home after a fight with Helen and gets a job as a...telemarketer.

Sid notices a tree stump teeming with little creatures while clearing out space in the yard to make a basketball court. Then he learns that there are animal habitats everywhere and that destroying one animal habitat affects other animals and habitats.

A look at helping includes Mister Rogers learning about Chinese calligraphy. Also: he draws with chalk and watches a video on how chalk is made; people discover that Lady Elaine is afraid of vacuum cleaners.

Clifford can't resist going into a field to play---even after Emily Elizabeth tells him he's not allowed to; Clifford messes up Mr. Bleakman's new potato garden, and Emily Elizabeth doesn't like Mr. Bleakman's reaction.

Daniel decides to send his dad a letter after seeing how happy a letter from his grandfather made him; Daniel learns how bread is made when he and Dad go to Baker Aker's Bakery to buy banana bread for Mom.

Perry Parasaurolophus, a dinosaur with a crest on his head, teaches Buddy, Tiny, Shiny and Don a new way to hoot hip tunes. Later Buddy and Tiny attend an egg-hatching party, where they meet their pal Cory Corythosaurus' new siblings.

Tiny feels left out when Buddy joins a special club for dinosaurs that eat meat, walk on two legs and have three-toed feet. Then Tiny, Shiny and Don throw a surprise party for Buddy on the Dinosaur Train.

Peg and Cat rebuild their Hot Buttered Lightin' race car in order to compete in the Talla-peg-a 20 race; Peg and Cat need to find the other members of their Electric Eleven band so that they can play a gig for 100 chickens.

Nick likes his tree house so much that he wonders what it would be like to stay in a tree all of the time. As a result, Cat teaches him and Sally about animals that spend their entire lives in trees. Later, Cat introduces the kids to his pal Gecko, who's a master at hiding in plain sight.

WETA Television and Classical WETA 90.9 FM are community-based public broadcasting stations serving the Washington area and supported by listeners and viewers. WETA is also a major producing station for PBS.

Burgers in Washington

Explore the gamut of great burgers in Greater Washington, from greasy to gourmet. This documentary visits over a dozen burger joints in the area, showcasing classic burgers to exotic and quirky updates on this favorite All-American food.

Burgers in Washington

Explore the gamut of great burgers in Greater Washington, from greasy to gourmet. This documentary visits over a dozen burger joints in the area, showcasing classic burgers to exotic and quirky updates on this favorite All-American food.

WETA History Timeline

Enjoy this step through time charting WETA's history from its founding in the 1950s as an educational television station, the addition of a public radio station, and evolution into a major national producer for PBS.